BIOL 200 Lecture Notes - Lecture 8: Immune System, Non-Cellular Life, Nasal Hair
14 Apr 2020
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Document Summary
Acellular infectious particle consisting of nucleic acid surrounded by a protein shell considered nonliving : not made of cells can store their genetic info in form of either dna or rna. Immune system: a system of cells and tissues that acts to defend the body against. Pathogens (cid:8869) foreign particles : viruses , bacteria , parasite that cause immune response react against foreign or. Two primary lines of defense provide immunity resistance to a given pathogen conferred by the activity of immune system. Innate: non - specific defense, present from birth , always active. & chemical barriers & (cid:8869) physical specialized white blood cells. I: highly diverse, mediated by cells called lymphocytes long - lasting immunity against specific pathogens. Chemical defense enzymes in saliva: nasal hair & mucus cilia runny nose , coughs , sneezes complement proteins fever. Inflammation: activated by infection or tissue damage release histamine : blood vessel leakage attracts white blood cells.
